CN105044769B - The method for improving the resolution ratio of seismic signal - Google Patents
The method for improving the resolution ratio of seismic signal Download PDFInfo
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Abstract
The present invention provides a kind of method for the resolution ratio for improving seismic signal, including：(A) geological data of common midpoint gather is obtained, and geological data is divided into multiple frequency dividing geological datas corresponding to different frequency range；(B) each frequency dividing geological data is transformed to divide stacked section data；(C) amplitude data of each frequency dividing stacked section data is handled, to obtain the processing amplitude data for corresponding to each frequency dividing geological data；(D) instantaneous amplitude data, the instantaneous phase data of each frequency dividing geological data are obtained；(E) albefaction that each frequency dividing geological data is obtained by the instantaneous amplitude data and instantaneous phase data divides geological data；(F) by dividing geological data and processing amplitude data acquisition reconstruct geological data corresponding to the albefaction of all frequency dividing geological datas.
Description
Technical Field
The present invention relates to the field of processing seismic signals, and more particularly to a method of improving the resolution of seismic signals.
Background
In seismic exploration, due to the inconsistency of excitation, propagation and receiving factors, the amplitude, the phase and the frequency of each channel in a seismic record have large difference, and the resolution of seismic data is seriously reduced. In particular, in seismic data of common midpoint gathers, the resolution of seismic data for far offset traces differs greatly from that of near offset traces, resulting in low resolution of the stack sections obtained from the seismic data. Therefore, improving the resolution of seismic data is the basis for analysis of the earth formation using seismic data.
Generally, a method of improving resolution of seismic data for a common midpoint gather includes: a method of improving the resolution of seismic data by thresholding the instantaneous amplitude and instantaneous phase to enhance the instantaneous frequency within a predetermined frequency band; and a method for improving the resolution of seismic data by broadening the amplitude spectrum within the effective frequency band while maintaining the phase unchanged. However, the above method is computationally complex, has poor controllability, and cannot obtain detailed information of seismic data, i.e., the obtained seismic data has low resolution.
Therefore, the existing method for improving the resolution of the seismic data cannot obtain the seismic data with higher resolution.
Disclosure of Invention
An exemplary embodiment of the present invention is to provide a method of improving resolution of seismic data. The method can overcome the defect that seismic data with higher resolution cannot be obtained in the prior art.
According to an exemplary embodiment of the present invention, there is provided a method of improving resolution of seismic data, including: (A) acquiring seismic data of a common midpoint gather, and dividing the seismic data into a plurality of frequency division seismic data corresponding to different frequency bands; (B) converting each frequency division seismic data into frequency division stacking profile data; (C) processing the amplitude data of each frequency-divided stacking profile data to obtain processed amplitude data corresponding to each frequency-divided seismic data; (D) acquiring instantaneous amplitude data and instantaneous phase data of each frequency division seismic data; (E) obtaining whitened frequency-division seismic data of each frequency-division seismic data through the instantaneous amplitude data and the instantaneous phase data; (F) reconstructed seismic data is obtained by whitening the divided seismic data corresponding to each divided seismic data and processing the amplitude data.
Optionally, step (a) comprises: (A1) acquiring seismic data of a common midpoint gather, and performing Fourier transform on the acquired seismic data to acquire seismic data of a frequency domain; (A2) dividing the seismic data of the frequency domain into a plurality of frequency domain frequency division seismic data corresponding to different frequency bands; (A3) and carrying out Fourier inversion on the frequency division seismic data of the multiple frequency domains to obtain multiple frequency division data of the time domain corresponding to different frequency bands.
Optionally, each of the different frequency bands has a predetermined bandwidth.
Optionally, step (C) comprises: (C1) selecting frequency division stacking profile data with the highest signal-to-noise ratio from all frequency division stacking profile data as main frequency division stacking profile data; (C2) performing Fourier transform on each frequency division stacking section data to obtain amplitude data of a frequency domain of each frequency division stacking section data; (C3) normalizing the amplitude data of each frequency division stacking profile data by taking the amplitude data of the main frequency division stacking profile data as a basic unit to obtain normalized amplitude data of each frequency division stacking profile data; (C4) the normalized amplitude data of each frequency-divided stacked profile data is subjected to inverse fourier transform to obtain processed amplitude data corresponding to each frequency-divided seismic data, respectively.
Optionally, step (D) comprises: (D1) performing Hilbert transform on each frequency division seismic data to obtain Hilbert transform data corresponding to each frequency division seismic data; (D2) and obtaining instantaneous amplitude data and instantaneous phase data of each frequency division seismic data by using the Hilbert transform data and the corresponding frequency division seismic data.
Optionally, the step of obtaining whitened seismic data corresponding to any of the seismic data of frequency division in each seismic data of frequency division in step (E) comprises: (E1) obtaining instantaneous frequency data of any frequency division seismic data by using the instantaneous phase data of any frequency division seismic data; (E2) performing Fourier transform on any frequency division seismic data to obtain any frequency division seismic data in a frequency domain, and obtaining whitened instantaneous amplitude data of any frequency division seismic data by using any frequency division seismic data in the frequency domain, instantaneous amplitude data of any frequency division seismic data and instantaneous frequency data; (E3) and performing Hilbert inverse transformation on the instantaneous phase data and the whitened instantaneous amplitude data of any frequency division seismic data to obtain whitened frequency division seismic data of a time domain of any frequency division seismic data.
Optionally, step (F) comprises: (F1) multiplying the whitened frequency division seismic data corresponding to the time domain of each frequency division seismic data by the processed amplitude data to obtain frequency division reconstruction seismic data; (F2) and stacking all the frequency division reconstruction seismic data to obtain the reconstruction seismic data of the time domain.
In the method of improving the resolution of seismic data according to an exemplary embodiment of the present invention, seismic data with higher accuracy can be obtained by frequency-dividing seismic data of a common midpoint gather, whitening the frequency-divided seismic data, and processing the amplitude of the frequency-divided seismic data. And further more fine stratum information can be obtained through the obtained seismic data with higher precision.
Drawings
The above and other objects and features of exemplary embodiments of the present invention will become more apparent from the following description taken in conjunction with the accompanying drawings which illustrate exemplary embodiments, wherein:
FIG. 1 illustrates a flow chart of a method of improving resolution of seismic data according to an exemplary embodiment of the invention;
FIG. 2 shows a diagram of a stack profile obtained from seismic data of a common midpoint gather;
FIG. 3 illustrates an amplitude spectrum obtained from seismic data acquired for a common midpoint gather;
FIG. 4 shows a flow chart of a step of obtaining frequency-divided seismic data in a method of improving resolution of seismic data according to an exemplary embodiment of the invention;
FIG. 5 shows a flowchart of the step of obtaining processed amplitude data in a method of improving resolution of seismic data according to an exemplary embodiment of the invention;
FIG. 6 shows a flowchart of the whitened seismic data-dividing step of obtaining any seismic data-dividing in a method of improving the resolution of seismic data according to an exemplary embodiment of the invention;
FIG. 7 shows a diagram of a stack profile obtained by reconstructing seismic data, according to an exemplary embodiment of the invention;
FIG. 8 illustrates an amplitude spectrum obtained by reconstructing seismic data according to an exemplary embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present invention now will be described more fully hereinafter with reference to the accompanying drawings, in which exemplary embodiments are shown. Example embodiments may, however, be embodied in many different forms and should not be construed as limited to the example embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the exemplary embodiments to those skilled in the art.
FIG. 1 shows a flow diagram of a method of improving resolution of seismic data according to an exemplary embodiment of the invention.
In step S100, seismic data of a common midpoint gather is acquired, and the seismic data is divided into a plurality of frequency-divided seismic data corresponding to different frequency bands.
Here, the acquired seismic data of the common midpoint gather is seismic data obtained by preprocessing acquired seismic data.
FIG. 2 shows a diagram of a stack section obtained from seismic data of a common midpoint gather.
As can be seen from fig. 2, since the resolution of the acquired seismic data is low, the resolution of the generated stacking section is low, and therefore, it is difficult to obtain a fine earth structure by the stacking section shown in fig. 2.
FIG. 3 illustrates an amplitude spectrum obtained from seismic data acquired for a common midpoint gather.
As can be seen from fig. 3, the frequency band of the amplitude spectrum of the obtained seismic data is narrow, and the effective amplitude is concentrated in a small frequency range, and therefore, it is difficult to obtain detailed information of the earth formation from the amplitude spectrum.
Here, after acquiring the seismic data of the common midpoint gather, in order to improve the resolution of the acquired seismic data, the seismic data may be divided into a plurality of frequency-divided seismic data corresponding to different frequency bands. Specifically, the acquired seismic data in the time domain may be first converted into seismic data in the frequency domain, the seismic data in the frequency domain may be then divided into frequency-domain frequency-division seismic data by frequency band, and the frequency-domain frequency-division seismic data may be converted into the time domain, thereby obtaining a plurality of frequency-division seismic data corresponding to different frequency bands.
FIG. 4 shows a flowchart of the step of obtaining divided frequency seismic data in a method of improving resolution of seismic data according to an exemplary embodiment of the invention.
In step S110, seismic data of the common midpoint gather is acquired, and fourier transform is performed on the acquired seismic data to obtain seismic data in a frequency domain.
Here, the acquired seismic data of the common midpoint gather is seismic data in a time domain, and in order to divide the seismic data by frequency bands, it is necessary to perform fourier transform on the acquired seismic data to convert the seismic data in the time domain into seismic data in a frequency domain.
In step S120, the seismic data of the frequency domain is divided into a plurality of frequency domain divided seismic data corresponding to different frequency bands.
As an example, when dividing seismic data of a frequency domain into n frequency domain divided seismic data corresponding to n different frequency bands, n narrow band pass filters may be used to divide the seismic data into n frequency domain divided seismic data, n being an integer greater than 1. Here, in order to reduce the gips effect and the frequency leakage, a band pass filter gate of an isosceles trapezoid shape may be selected when the narrow band pass filter is provided.
As an example, each of the different frequency bands may have a predetermined bandwidth. Namely, the bandwidth corresponding to each frequency domain frequency division seismic data is the same.
In step S130, inverse fourier transform is performed on the frequency division seismic data in the multiple frequency domains, so as to obtain multiple frequency division data corresponding to different frequency bands in the time domain.
Here, for the subsequent processing, it is necessary to convert each frequency domain frequency division seismic data of the frequency domain into frequency division seismic data of the time domain.
Referring again to FIG. 1, in step S200, each of the frequency-divided seismic data is converted into frequency-divided stacked profile data. Here, each frequency-divided seismic data may be converted into frequency-divided stacked profile data by way of gather stacking.
In step S300, the amplitude data of each frequency-divided superposition section data is processed to obtain processed amplitude data corresponding to each frequency-divided seismic data.
Here, the processed amplitude data corresponding to each of the frequency-divided seismic data may be obtained by selecting frequency-divided stacked section data having the highest signal-to-noise ratio from the frequency-divided stacked section data, and normalizing the amplitude of each of the frequency-divided stacked section data with the amplitude of the selected frequency-divided stacked section data as a basic unit.
FIG. 5 shows a flowchart of the step of obtaining processed amplitude data in a method of improving resolution of seismic data according to an exemplary embodiment of the invention;
in step S310, the frequency-divided superimposition profile data having the highest signal-to-noise ratio is selected from all the frequency-divided superimposition profile data as the main frequency-divided superimposition profile data.
Here, the frequency-division stacking section data with the highest signal-to-noise ratio is the frequency-division stacking section data including the most effective seismic signals.
In step S320, fourier transform is performed on each frequency-divided superimposed section data, and amplitude data of the frequency domain of each frequency-divided superimposed section data is obtained.
Here, since the frequency-divided superimposed section data is time-domain frequency-divided superimposed section data, amplitude data of the superimposed section data in the frequency domain can be obtained by fourier transform.
For example, each frequency-divided superimposed profile data may be fourier transformed by the following equation:
wherein,the k-th frequency-division-superimposed profile data of the frequency domain after fourier transform,is the kth frequency division superposition profile data of the time domain, and k is an integer greater than or equal to 1. t represents time, f represents frequency, and i represents a complex number. It should be understood that when dividing seismic data into n-divided seismic data in the above example, k should also be equal to or less than n.
In step S330, the amplitude data of each frequency-divided superimposed section data is normalized using the amplitude data of the main frequency-divided superimposed section data as a basic unit, and normalized amplitude data of each frequency-divided superimposed section data is obtained.
Here, since the main-cross-sectional-stack data includes the largest number of effective seismic signals, the effective frequency band range of the amplitude of the main-cross-sectional-stack data is the widest, and therefore, by normalizing the amplitude data of each cross-sectional-stack data with the amplitude data of the main-cross-sectional-stack data as a basic unit, the effective frequency band range of the amplitude of each cross-sectional-stack data can be effectively widened.
By way of example, normalization may be performed as follows: first, the maximum amplitude value is selected from the amplitude data of the main frequency-division-superimposed profile dataAnd takes the maximum amplitude valueAs a basic unit 1, i.e. the amplitude valueNormalized toThen, the maximum amplitude value is divided from the amplitude data of each frequency-divided superimposed profile dataAmplitude of any other amplitudeNormalization is performed according to the following equation:
wherein,is to any amplitude valueThe normalized amplitude value for the normalization is performed,the maximum amplitude value is obtained.
In step S340, the normalized amplitude data of each frequency-divided stacked profile data is subjected to inverse fourier transform to obtain processed amplitude data respectively corresponding to each frequency-divided seismic data.
Here, the normalized amplitude data of each frequency-division stacked profile data is subjected to inverse fourier transform in order to obtain processed amplitude data of a time domain corresponding to each frequency-division seismic data, respectively.
Referring again to fig. 1, in step S400, instantaneous amplitude data and instantaneous phase data for each of the divided seismic data are obtained.
Here, each of the divided frequency seismic data may be first subjected to hilbert transform, and hilbert transform data corresponding to each of the divided frequency seismic data may be obtained.
Instantaneous amplitude data and instantaneous phase data of each frequency-divided seismic data are then obtained using the Hilbert transform data and the corresponding frequency-divided seismic data.
Here, the acquired instantaneous amplitude data and instantaneous phase data are instantaneous amplitude data and instantaneous phase data of a time domain. For example, the acquired instantaneous amplitude data and instantaneous phase data can be represented by the following equations:
wherein, αk(t) instantaneous amplitude data, theta, representing the kth frequency-divided seismic datak(t) instantaneous phase data, x, representing the kth frequency-divided seismic datak(t) denotes the kth frequency-divided seismic data, hibk(t) Hilbert transform data representing kth frequency-division seismic data, and the definition of k can be referred to the above example.
In step S500, whitened seismic data of each seismic data is obtained from the instantaneous amplitude data and the instantaneous phase data.
Here, for any of the divided-frequency seismic data, instantaneous frequency data may be obtained by instantaneous phase data of the any of the divided-frequency seismic data, whitened instantaneous amplitude data may be obtained by the instantaneous frequency data and the instantaneous amplitude data, and whitened divided-frequency seismic data of the any of the divided-frequency seismic data may be obtained by the whitened instantaneous amplitude data and the instantaneous phase data.
FIG. 6 shows a flowchart of the step of obtaining whitened seismic data for any of the seismic data divisions in a method of improving resolution of seismic data according to an exemplary embodiment of the invention.
In step S510, instantaneous frequency data of any frequency division seismic data is obtained by using the instantaneous phase data of any frequency division seismic data.
In step S520, fourier transform is performed on the any frequency division seismic data to obtain any frequency division seismic data in a frequency domain, and whitened instantaneous amplitude data of the any frequency division seismic data is obtained by using the any frequency division seismic data in the frequency domain, the instantaneous amplitude data of the any frequency division seismic data, and the instantaneous frequency data.
Here, the amplitude spectrum x of the frequency domain of the kth frequency-divided seismic data may be obtained by the obtained any one of the frequency-divided seismic data (for example, the kth frequency-divided seismic data in the above-described example)k(f) And said amplitude spectrum x can be obtainedk(f) Envelope e ofk(f) By the envelope e foundk(f) A whitening filter is provided for acquiring whitened instantaneous amplitude data. For example, the whitening filter may be set by the following equation:
wherein Hk(f) Representing a whitening filter corresponding to the kth frequency-divided seismic data (i.e. said any frequency-divided seismic data), ek(f) Representing the envelope, u, of the amplitude spectrum of the resolved kth frequency-divided seismic datakRepresenting an envelope ek(f) β is a white noise factor here, the white noise factor β can be set to 0.01 in general.
When the whitening filter H is setk(f) The whitened transient amplitude data of any of the frequency-divided seismic data can then be obtained by substituting the transient amplitude data into a whitening filter. For example, the whitened instantaneous amplitude data of any of the frequency-divided seismic data may be obtained by the following equation:
bk(t)＝αk(t)Hk(fk(t))
wherein, bk(t) whitening transient amplitude data representing the kth frequency-divided seismic data (i.e., any of the frequency-divided seismic data), αk(t) is the instantaneous amplitude data of the kth frequency-divided seismic data in the above example, fk(t) represents instantaneous frequency data obtained at step S510.
In step S530, the instantaneous phase data and whitened instantaneous amplitude data of any frequency division seismic data are subjected to hilbert inverse transform, so as to obtain whitened frequency division seismic data of a time domain of any frequency division seismic data.
Here, the obtained whitened frequency-division seismic data can effectively highlight seismic signals with weak energy in the seismic data.
Referring again to fig. 1, at step S600, reconstructed seismic data is obtained by whitening the frequency-divided seismic data corresponding to each frequency-divided seismic data and processing the amplitude data.
As an example, whitened frequency-divided seismic data corresponding to a time domain of each frequency-divided seismic data may be multiplied by processed amplitude data to obtain frequency-divided reconstructed seismic data. For example, when n-th divided seismic data are divided in total, frequency-division reconstructed seismic data corresponding to the kth divided seismic data can be obtained by the following equation:
wherein s isk(t) denotes frequency-division reconstructed seismic data corresponding to the kth frequency-division seismic data, zk(t) whitened seismic data representing a time domain of the kth seismic data,representing processed amplitude data corresponding to the kth frequency-divided seismic data.
And then, stacking all frequency division reconstruction seismic data to obtain reconstruction seismic data of a time domain.
Here, the frequency-divided seismic data z are whitenedk(t) effectively highlighting seismic signals with weak energy in the seismic data, processing the amplitude dataTo widen the effective band range of the amplitude data,thus, frequency-dividing seismic data z by whiteningk(t) and processing the amplitude dataThe resolution of the seismic data can be greatly improved by the obtained reconstructed seismic data.
FIG. 7 illustrates a diagram of a stack section obtained by reconstructing seismic data according to an exemplary embodiment of the present invention.
As can be seen from fig. 7, since the resolution of the obtained reconstructed seismic data is high, and thus the resolution of the generated stacking section is high, a fine earth structure can be obtained by the stacking section shown in fig. 7.
FIG. 8 illustrates an amplitude spectrum obtained by reconstructing seismic data according to an exemplary embodiment of the present invention.
As can be seen from fig. 8, the frequency band of the amplitude spectrum of the reconstructed seismic data is wide, and the effective amplitudes are dispersed over a wide frequency range, so that the detailed information of the earth formation can be obtained from the amplitude spectrum.
In the method of improving the resolution of seismic data according to an exemplary embodiment of the present invention, seismic data with higher accuracy can be obtained by frequency-dividing seismic data of a common midpoint gather, whitening the frequency-divided seismic data, and processing the amplitude of the frequency-divided seismic data. And further more fine stratum information can be obtained through the obtained seismic data with higher precision.
While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims.
Claims (5)
1. A method of improving resolution of seismic data, comprising:
(A) acquiring seismic data of a common midpoint gather, and dividing the seismic data into a plurality of frequency division seismic data corresponding to different frequency bands;
(B) converting each frequency division seismic data into frequency division stacking profile data;
(C) processing the amplitude data of each frequency-divided stacking profile data to obtain processed amplitude data corresponding to each frequency-divided seismic data;
(D) acquiring instantaneous amplitude data and instantaneous phase data of each frequency division seismic data;
(E) obtaining whitened frequency-division seismic data of each frequency-division seismic data through the instantaneous amplitude data and the instantaneous phase data;
(F) reconstructed seismic data is obtained by whitening the divided seismic data corresponding to each divided seismic data and processing the amplitude data,
wherein step (C) comprises:
(C1) selecting frequency division stacking profile data with the highest signal-to-noise ratio from all frequency division stacking profile data as main frequency division stacking profile data;
(C2) performing Fourier transform on each frequency division stacking section data to obtain amplitude data of a frequency domain of each frequency division stacking section data;
(C3) normalizing the amplitude data of each frequency division stacking profile data by taking the amplitude data of the main frequency division stacking profile data as a basic unit to obtain normalized amplitude data of each frequency division stacking profile data;
(C4) carrying out Fourier inversion on the normalized amplitude data of each frequency division stacking section data to obtain processed amplitude data respectively corresponding to each frequency division seismic data;
wherein the step (E) of obtaining whitened seismic data corresponding to any of the seismic data of frequency division in each seismic data of frequency division comprises:
(E1) obtaining instantaneous frequency data of any frequency division seismic data by using the instantaneous phase data of any frequency division seismic data;
(E2) performing Fourier transform on any frequency division seismic data to obtain any frequency division seismic data in a frequency domain, and obtaining whitened instantaneous amplitude data of any frequency division seismic data by using any frequency division seismic data in the frequency domain, instantaneous amplitude data of any frequency division seismic data and instantaneous frequency data;
(E3) and performing Hilbert inverse transformation on the instantaneous phase data and the whitened instantaneous amplitude data of any frequency division seismic data to obtain whitened frequency division seismic data of a time domain of any frequency division seismic data.
2. The method of claim 1, wherein step (a) comprises:
(A1) acquiring seismic data of a common midpoint gather, and performing Fourier transform on the acquired seismic data to acquire seismic data of a frequency domain;
(A2) dividing the seismic data of the frequency domain into a plurality of frequency domain frequency division seismic data corresponding to different frequency bands;
(A3) and carrying out Fourier inversion on the frequency division seismic data of the multiple frequency domains to obtain multiple frequency division data of the time domain corresponding to different frequency bands.
3. The method of claim 1, wherein each of the different frequency bands has a predetermined bandwidth.
4. The method of claim 1, wherein step (D) comprises:
(D1) performing Hilbert transform on each frequency division seismic data to obtain Hilbert transform data corresponding to each frequency division seismic data;
(D2) and obtaining instantaneous amplitude data and instantaneous phase data of each frequency division seismic data by using the Hilbert transform data and the corresponding frequency division seismic data.
5. The method of claim 1, wherein step (F) comprises:
(F1) multiplying the whitened frequency division seismic data corresponding to the time domain of each frequency division seismic data by the processed amplitude data to obtain frequency division reconstruction seismic data;
(F2) and stacking all the frequency division reconstruction seismic data to obtain the reconstruction seismic data of the time domain.
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| CN108072894A (en) * | 2016-11-18 | 2018-05-25 | 中国石油化工股份有限公司 | A kind of seismic data processing method |
| CN107728200B (en) * | 2017-09-29 | 2019-03-29 | 中国石油化工股份有限公司 | Ground micro-seismic fracturing fracture dynamic spread method of real-time |
| CN112630822B (en) * | 2019-10-08 | 2024-06-18 | 中国石油化工股份有限公司 | Method and system for processing OVT domain pre-stack seismic data |
| CN112649873B (en) * | 2019-10-10 | 2024-04-09 | 中国石油化工股份有限公司 | Seismic data frequency division motion correction processing method and system |
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